Short-term variability of physico-chemical parameters and the estimated transport of filterable nutrients and chlorophyll-a in the urbanised Coombabah Lake and Coombabah Creek system, southern Moreton Bay, Australia

File Size Format
48558_1.pdf 205Kb Adobe PDF View
Title Short-term variability of physico-chemical parameters and the estimated transport of filterable nutrients and chlorophyll-a in the urbanised Coombabah Lake and Coombabah Creek system, southern Moreton Bay, Australia
Author Dunn, Ryan Jay Keith; Ali, Ayub; Lemckert, Charles James; Teasdale, Peter; Welsh, David Thomas
Journal Name Journal of Coastal Research
Year Published 2007
Place of publication United States
Publisher Coastal Education & Research Foundation Inc.
Abstract Extensive urban development has occurred within the Coombabah Creek catchment and surrounds over the last two decades, resulting in concerns about degrading water quality. Water quality was investigated three times during summer and three times during autumn/winter at two sites: within Coombabah Lake and at several km downstream within Coombabah Creek. Physico-chemical parameters, suspended solids, chlorophyll-a and filterable nutrients (reactive PO4 3-, NO2 -, NO3 - and NH3 -) were measured hourly for 13 hours in order to compare the water quality under different tidal conditions at each site. Bathymetric and hydrological data were also collected, which allowed short-term nutrient loads to be estimated. From these measurements, the net transport of filterable nutrients and chlorophyll-a into Coombabah Lake and the intratidal variability of Coombabah Creek and Lake waters were determined. Physico-chemical parameters, suspended solids and chlorophyll-a concentrations demonstrated characteristic cyclic variations with the influence of tidal and diurnal cycles apparent. Despite elevated nutrient concentrations, chlorophyll-a values indicated an oligotrophic-mesotrophic environment, with concentrations ranging between 0.11-3.53 μg L-1. Maximum concentrations occurred during ebb tides, coinciding with periods of increased solar radiation. Elevated total suspended solids were observed during increased current velocities during low tide periods and greater wind speeds within the lake. Filterable nutrient concentrations and transport estimations also demonstrated tidal influences, with increased concentrations observed during sampled high tide phases, indicating increased inputs of nutrients originating from sources other than the creek and lake. Observed reactive PO4 3-, NOx and NH3 - concentrations exceeded Broadwater sub-region values within the Queensland Water Quality Guidelines (2006).
Peer Reviewed Yes
Published Yes
Publisher URI http://www.cerf-jcr.org/
Copyright Statement Copyright 2007 CERF. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 50
Page from 1062
Page to 1068
ISSN 0749-0208
Date Accessioned 2008-02-18
Date Available 2008-07-16T01:25:06Z
Language en_AU
Research Centre Centre for Infrastructure Engineering and Management; Environmental Futures Research Institute
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Earth Sciences
URI http://hdl.handle.net/10072/17634
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

Brief Record

Griffith University copyright notice